CN112178685A - Combustion optimization control system of heating furnace - Google Patents
Combustion optimization control system of heating furnace Download PDFInfo
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- CN112178685A CN112178685A CN202010892268.6A CN202010892268A CN112178685A CN 112178685 A CN112178685 A CN 112178685A CN 202010892268 A CN202010892268 A CN 202010892268A CN 112178685 A CN112178685 A CN 112178685A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
Abstract
The invention discloses a combustion optimization control system of a heating furnace, which comprises: air regulating valve, gas composition on-line detector, gas flowmeter and flue gas CO2The on-line detector and controller, the controller is used for: acquiring the gas flow detected by the gas flow meter, the gas components detected by the gas component on-line detector and the flue gas CO2CO in heating furnace detected by online detector2Content, and current time of the currently acquired data; obtaining a first air flow according to the gas flow and the gas composition; adjusting the flow size of an air adjusting valve to a first air flow after delaying based on the current time; further, according to the first air flow rate and CO2Content, performing feedback regulation on the air regulating valve to obtain a second air flow; the adjustment precision is improved by one step in the feedback adjustment. The invention realizes the accurate control of the air flow of the heating furnace and reduces the discharge nodeAnd energy sources are saved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a heating furnace combustion optimization control system.
Background
The fuel furnace provides heat to heat the workpiece by releasing chemical heat through fuel combustion, and the control of the supply of combustion-supporting air in the combustion process directly influences the energy utilization efficiency and harmful substances such as CO and NOXThe technical and economic indexes in various aspects such as the emission level, the heating atmosphere in the furnace, the product quality and the like are the control contents of a core in the fuel combustion control. The amount of fuel supplied for combustion is typically determined based on furnace temperature and process requirements, while the amount of air required for fuel combustion is adjusted based on air-fuel ratio. The air-fuel ratio is the ratio of the air supply amount to the fuel amount during combustion, and excessive air supply can cause energy waste, combustion temperature reduction, oxidation burning loss increase and harmful gas NOXThe problems of increased emission and the like, and the problems of incomplete combustion of fuel, increased chemical heat loss, reduced energy utilization rate, overproof smoke CO emission and the like exist when the air quantity is not supplied enough. According to the actual requirement, an optimal process control value exists in the air quantity supply.
However, in actual mass production processes, various atmospheric conditions are constantly fluctuating. At present, each large fuel furnace mostly adjusts and controls the air supply quantity in a mode of manually setting the air-fuel ratio in a furnace computer control system, and the control is single in condition according to which the control precision is low, so that the large fuel furnace cannot be well adapted to the production environment with changeable fields.
Disclosure of Invention
In view of the above problems, the present invention provides a heating furnace combustion optimization control system, which can accurately control the air flow of the heating furnace, ensure the full combustion of the fuel gas in the heating furnace, reduce the emission and save the energy.
The application provides the following technical scheme through an embodiment:
a furnace combustion optimization control system, comprising: air regulating valve, gas composition on-line detector, gas flowmeter and flue gas CO2The online gas component detector and the gas flowmeter are sequentially arranged on the gas pipeline according to the gas flow direction, and the flue gas CO is2The online detector is arranged at the inlet of a tail flue of the heating furnace; air control valve, gas flowmeter, online gas component detector and flue gas CO2The online detectors are in communication connection with the controller; the controller is configured to: acquiring the gas flow detected by the gas flow meter, the gas component detected by the gas component online detector and the flue gas CO2CO in heating furnace detected by online detector2Content, and current time; wherein the current time is a time point for acquiring the gas flow; obtaining a first air flow rate according to the gas flow rate and the gas composition; adjusting the flow size of the air adjustment valve to the first air flow rate after a delay based on the current time; according to the first air flow and the CO2Content, performing feedback regulation on the air regulating valve to obtain a second air flow; the second air flow is the final flow size of the air adjusting valve.
Optionally, the controller is specifically configured to:
based on model Qt1＝n*L0*VtObtaining a first air flow rate; wherein Q ist1Is a first air flow rate, n is an excess air coefficient, L0Is the theoretical amount of air, V, of fueltIs the gas flow; l is0＝4.7619*(0.5*L1+0.5*L2+2*L3+0.04-L4) Wherein L is1Is H2Theoretical amount of consumed air, L2Theoretical consumption of air for CO, L3Is CH4Theoretical amount of consumed air, L4Is the amount of oxygen in the fuel gas.
Optionally, the air excess coefficient is 1.05.
Optionally, the controller is specifically configured to:
optionally, the controller is specifically configured to:
adjusting a feedback adjustment quantity for the first air flow to obtain a first adjustment value; adjusting the air regulating valve to a first adjusting value to obtain flue gas CO2A first feedback detection value detected by the online detector;when the first feedback detection value is larger than the CO2Adjusting the first adjusting value by a feedback adjusting quantity according to the adjusting direction of the last adjustment to obtain a second adjusting value; or when the first feedback detection value is smaller than the CO2Adjusting the first adjusting value by a feedback adjusting quantity according to the opposite adjusting direction of the last adjustment to obtain a second adjusting value; wherein the adjustment direction comprises an increase adjustment or a decrease adjustment; adjusting the air regulating valve to a second adjustment value to obtain flue gas CO2A second feedback detection value detected by the online detector; obtaining a second air flow rate when the second feedback detection value is less than or equal to the first feedback detection value; and when the second feedback detection value is larger than the first feedback detection value, continuing to perform feedback regulation on the air regulating valve according to the second regulation value and the feedback regulation amount until the second air flow is obtained.
Optionally, the controller is specifically configured to:
obtaining delay time according to the distance between the gas component online detector and the gas flowmeter, the section area of the gas pipeline and the gas flow; and adjusting the flow of the air adjusting valve to the second air flow after delaying the delay time length based on the current time.
Optionally, the controller is a PLC control system or a DCS control system.
Optionally, the gas component online detector is a multi-component online gas mass analyzer.
Optionally, the flue gas CO2The on-line detector is an on-line infrared gas analyzer.
Optionally, the flue gas CO2The online detector is a laser online detector.
Optionally, the laser online detector has a detection transmitting end and a detection receiving end, and the detection transmitting end and the detection receiving end are respectively arranged on the furnace walls on two opposite sides of the heating furnace.
The invention provides combustion optimization of a heating furnaceThe control system comprises: air regulating valve, gas composition on-line detector, gas flowmeter and flue gas CO2The on-line detector and the controller are characterized in that an air regulating valve is arranged on an air pipeline, a gas component on-line detector and a gas flowmeter are sequentially arranged on the gas pipeline according to the gas flow direction, and the flue gas CO is2The online detector is arranged at the inlet of a tail flue of the heating furnace; air regulating valve, gas flowmeter, gas composition online detector and flue gas CO2The on-line detectors are in communication connection with the controller; the controller is used for: acquiring the gas flow detected by the gas flow meter, the gas components detected by the gas component on-line detector and the flue gas CO2CO in heating furnace detected by online detector2Content, and current time of the currently acquired data; according to the gas flow and the gas components, a first air flow is obtained, and the forward adjustment of the air flow direction can be realized; during adjustment, the flow of the air adjusting valve is adjusted to be the first air flow after time delay is carried out based on the current time, so that the detected gas component value is real data corresponding to the flow control moment, and the adjustment precision of the air flow is ensured; further, according to the first air flow rate and the CO2Content, performing feedback regulation on the air regulating valve to obtain a second air flow; the second air flow is the final flow of the air adjusting valve, and the adjusting precision is further improved through feedback adjustment. Through the system, the embodiment of the invention realizes the accurate control of the air flow of the heating furnace, ensures the full combustion of the fuel gas in the heating furnace, reduces the emission and saves the energy.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic structural diagram illustrating a combustion optimization control system of a heating furnace according to a first embodiment of the present invention;
FIG. 2 is a flow chart of the functional steps performed by the controller in a first embodiment of the present invention;
FIG. 3 shows CO in an exemplary furnace according to a first embodiment of the present invention2、CO、O2、NOxAnd the change relation with the air excess coefficient is shown schematically.
Icon: 100-a heating furnace combustion optimization control system; 1-heating a furnace; 2-a burner; 3-air regulating valve; 4-gas flow valve; 5-a gas flow meter; 6-an air flow meter; 7-gas component on-line detector; 8-a controller; 9-flue gas CO2An on-line detector.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
At present, there are several automatic control technologies for optimizing the combustion of a fuel furnace as follows:
1. the adjustment control from the oxidizing firing to the reducing firing is realized by a method of setting a target oxygen concentration on a heating furnace temperature control computer, calculating an air amount under a real-time fuel amount condition according to a preset air-fuel ratio calculation formula, and further adjusting an air supply amount. Although this method expands the adjustment range of the air-fuel ratio, it still adopts a manual setting method, but sets the target oxygen concentration rather than the target air-fuel ratio, and similarly cannot achieve the automatic control target of air optimization control according to the real-time fuel conditions.
2. The method comprises the steps of establishing an air-fuel ratio optimization control model, setting an optimization target function through heating furnace temperature weighting processing, designing an optimization step length, adopting a self-optimizing algorithm of a forward and backward method, calculating an optimized air-fuel ratio by taking the maximum value of a target function temperature value as a target, and adjusting the air quantity. The method takes the furnace temperature as an objective function, but a plurality of factors influencing the furnace temperature exist, the air-fuel ratio is only one of the factors, particularly the furnace temperature is directly influenced by the gas flow, and when the gas flow changes, the method cannot achieve the function of optimizing automatic control.
3. The residual oxygen content of gas in the furnace is detected on line through a zirconia analyzer arranged on the heating furnace, and is fed back to a Programmable Logic Controller (PLC) control module, and the air-fuel ratio correction is calculated to adjust the air supply quantity. The method has the biggest problems that a zirconia analyzer is low in detection precision and short in service life, is only used for detection and display in production, and still cannot realize full-automatic optimization control in a straight sense.
4. The flue gas components are detected by an online flue gas CO analyzer and an oxygen analyzer which are arranged on the furnace top, an adjusting threshold value is set in a DCS control system, and the air door valve plate is adjusted according to the method that whether the detected value is in the threshold value range or not.
5. The laser detection mechanism is arranged at each control section of the heating furnace to detect O in the gas in the furnace on line2And CO content, the air-fuel ratio is adjusted.
6. Gas sampling guns are arranged at each control section of the heating furnace to collect gas samples in the heating furnace, and then a flue gas analyzer is used for component analysis, so that the air-fuel ratio is adjusted. 4-6, because the fuel combustion process has the characteristics of pulsation and instability, the air flow condition in the fuel furnace is influenced by various factors such as burner arrangement, flame shape, furnace pressure control and the like, particularly, the gas in the furnace comprises flue gas after combustion, simultaneously unburned gas and burning gas exist, the gas component in the furnace is difficult to represent and reflect the actual state of the fuel combustion process, and the purpose and effect of optimizing control can not be realized correspondingly.
7. The utility model provides a heating furnace intelligence accurate combustion control system, includes central controller and oxygen content detector, and central controller contains optimum air-fuel ratio and sets for module, optimum air-fuel ratio automatically regulated module and air-fuel ratio feedback control module, detects residual oxygen in the flue gas through oxygen content detector, feeds back to air-fuel ratio feedback control module, and air-conditioning and coal gas governing valve control air-fuel ratio. The method adopts the feedback control of the residual oxygen signal of the flue gas, can effectively realize the automatic control of the combustion process under the conditions of high residual oxygen content and stable components, but has poor stability and accuracy of an automatic control system under the conditions of low residual oxygen content and component fluctuation.
8. And analyzing the CO content of the flue gas by timing cycle sampling, and controlling the air-fuel ratio to a target value. The method adopts flue gas CO signal feedback control, but because CO in the flue gas is mostly zero after the fuel is completely combusted, the system has narrow action range and low practicability.
The present invention is directed to the problems of the above prior art, and a combustion optimization control system for a heating furnace is developed, which can partially or completely solve the technical defects of the above prior art, and the detailed description of the system of the present invention can be understood with reference to the following embodiments.
Examples
Referring to fig. 1, fig. 1 is a schematic structural diagram illustrating a combustion optimization control system 100 for a heating furnace according to an embodiment of the present invention, which is used for controlling an air flow rate of the heating furnace 1.
Specifically, the heating furnace combustion optimization control system 100 includes: air regulating valve 3, gas flow valve 4, gas flowmeter 5, air flowmeter 6, gas composition on-line detector 7, controller 8 and flue gas CO2And an online detector 9. The air flow meter 6 and the air adjusting valve 3 are arranged in order in the air flow directionThe gas component online detector 7, the gas flowmeter 5 and the gas flow valve 4 are sequentially arranged on the gas pipeline according to the gas flow direction sequence. Flue gas CO2The online detector 9 is arranged at the inlet of the tail flue of the heating furnace 1. Both the air duct and the gas duct are connected to the burner 2. Air regulating valve 3, air flow meter 6, gas composition on-line detector 7, gas flow meter 5, gas flow valve 4 and flue gas CO2The online detectors 9 are all in communication connection with the controller 8.
In this embodiment, the controller 8 is a PLC Control System or a DCS (Distributed Control System) Control System. The controller 8 is connected with an air regulating valve 3, an air flow meter 6, a gas composition online detector 7, a gas flow meter 5, a gas flow valve 4 and the flue gas CO2The devices such as the online detector 9 can perform bidirectional communication, for example, an OPC protocol Object Linking and Embedding (OLE) for Process Control (OPC), a MODBUS protocol or a PROFIBUS protocol (Process FIeld BUS) is used for bidirectional data exchange; so that the controller 8 can collect data and the controller 8 can control the target. The specific connection method is well known to those skilled in the art and will not be described in detail.
And the gas composition online detector 7 is used for analyzing gas compositions. The gas composition on-line detector 7 in this embodiment may be a multi-component on-line gas mass analyzer.
Flue gas CO2An on-line detector 9 for detecting CO in the heating furnace 12The content can be specifically an online infrared gas analyzer. In the embodiment, another implementation mode is also provided, namely flue gas CO2The online detector 9 is a laser online detector. The laser on-line detector is provided with a detection transmitting end and a detection receiving end, wherein the detection transmitting end and the detection receiving end are respectively arranged on furnace walls on two opposite sides of the heating furnace 1. Therefore, the average smoke components of the heating furnace 1 in the width direction can be collected, and the measurement error caused by single-point sampling is reduced.
Further, referring to fig. 2, the controller 8 is further configured to perform the following control process:
step S10: acquiring the gas flow detected by the gas flow meter, the gas component detected by the gas component online detector and the flue gas CO2CO in heating furnace detected by online detector2Content, and current time; wherein the current time is a time point at which the gas component is obtained.
In step S10, the detected gas flow rate and CO are detected at the current time2The content gas flow meter 5 may be transmitted to the controller 8 and processed, e.g. calculated, stored, etc., by the controller 8.
Step S20: and obtaining a first air flow according to the gas flow and the gas composition.
In step S20, based on model Qt1＝n*L0*VtObtaining a first air flow rate; wherein Q ist1Is a first air flow rate, n is an excess air coefficient, L0Is the theoretical amount of air, V, of fueltIs the gas flow; l is0＝4.7619*(0.5*L1+0.5*L2+2*L3+0.04-L4) Wherein L is1Is H2Theoretical amount of consumed air, L2Theoretical consumption of air for CO, L3Is CH4Theoretical amount of consumed air, L4Is the amount of oxygen in the fuel gas. Obtaining the air flow of forward regulation through the calculation model; 4.7619 represents the amount of air required for 1 volume of oxygen; in order to improve the control accuracy, the oxygen amount required by the trace combustible component, namely the heavy hydrocarbon, in the fuel gas is set to 0.04, which is an average value obtained by manually sampling and analyzing samples.
Step S30: adjusting the flow size of the air adjustment valve to the first air flow rate after a delay based on the current time.
In step S30, a delay control is performed to ensure that the detected gas component is real data corresponding to the flow control time, thereby avoiding distortion in adjustment and ensuring the accuracy of adjustment of the air flow rate.
Specifically, the delay time is obtained according to the distance between the gas component online detector 7 and the gas flowmeter 5, the cross-sectional area of the gas pipeline, and the gas flow rate. The delay time duration can be expressed as Δ t ═ S × F/V, where Δ t is the delay time duration, S is the distance between the gas component online detector 7 and the gas flowmeter 5, F is the cross-sectional area of the gas pipeline, and V is the gas flow rate.
And finally, after the time delay duration is carried out based on the current time, the flow of the air adjusting valve 3 is adjusted to the first air flow. For example, if the current time is T, the actual time T for controlling the air adjustment valve 3 should be T ═ T +. DELTA.t, and the delay controller 8 may be used to implement delay control. Specifically, since the actual component of the gas whose flow rate is controlled at the time t is the detection result before time Δ t, the delay controller 8 stores the detection data of the gas component before time Δ t for use in the control at the time t to obtain the theoretical air demand at the time t. That is, the gas component detected at the current time t needs to actually reach the gas flow valve 4 after the time Δ t. The time delay adjustment is combined with the forward optimization control and the feedback adjustment control, so that the initial value of the air supply quantity can be quickly and accurately determined; then, the real-time air flow rate is compared with the air flow rate value actually measured by the air flow meter 6, and the air valve is adjusted in a PID (proportional Integral Differential) incremental adjustment mode, so that the real-time air flow rate can reach a required target value, namely the first air flow rate.
Step S40: according to the first air flow and the CO2Content, performing feedback regulation on the air regulating valve to obtain a second air flow; the second air flow is the final flow size of the air adjusting valve.
In step S40, CO2The content can reflect the actual combustion condition in the heating furnace 1, and the real-time CO in the flue gas is detected2Content, as a determination parameter whether the combustion state is in the optimum position, by CO2The content can be subjected to feedback fine adjustment on the air flow.
In particular, feedback trimming is also on the CO2The content value of (A) is optimized to findA maximum value. The fine tuning process of this embodiment is as follows:
1. adjusting a feedback adjustment quantity for the first air flow to obtain a first adjustment value; after the air adjusting valve 3 is adjusted to a first adjusting value, the flue gas CO is obtained2A first feedback detection value detected by the online detector 9;
2. when the first feedback detection value is larger than CO2Adjusting the first adjustment value by a feedback adjustment amount according to the adjustment direction of the last adjustment to obtain a second adjustment value; or when the first feedback detection value is less than CO2Adjusting the first adjustment value by a feedback adjustment amount according to the opposite adjustment direction of the last adjustment to obtain a second adjustment value; wherein the adjustment direction comprises an increase adjustment or a decrease adjustment;
3. after the air adjusting valve 3 is adjusted to the second adjusting value, the flue gas CO is obtained2A second feedback detection value detected by the online detector 9;
4. obtaining a second air flow rate when the second feedback detection value is less than or equal to the first feedback detection value;
5. and when the second feedback detection value is larger than the first feedback detection value, continuing to perform feedback regulation on the air conditioning valve according to the second regulation value and the feedback regulation amount until a second air flow is obtained.
At the second air flow position, CO in the heating furnace can be enabled2The content reaches a maximum or a vicinity thereof. The feedback adjustment amount in this embodiment may be set according to a specific operating condition environment, and may be set to a small value.
As shown in FIG. 3, an exemplary furnace 1 for CO production is shown2、CO、O2、NOxAnd the change relation with the air excess coefficient is shown schematically. Wherein, CO2The content of (1) is increased along with the increase of the actual air excess coefficient, and after reaching an extreme value, the content of (2) is reduced along with the increase of the actual air excess coefficient, and the extreme value state is the state of complete combustion of the fuel gas and highest energy utilization efficiency. The CO in the flue gas is a place with good combustion effect and reduced along with the increase of the actual air excess coefficient, and the CO approaches to zero after the air excess coefficient reaches 1.0. Air (a)The excess factor is around 1.0 and the CO content is in the order of ppm (parts per million concentration). And O in the flue gas2The change rule is opposite to the CO rule, and the O in the smoke gas is generated along with the increase of the actual air surplus coefficient2The content is continuously increased, and before the air excess coefficient reaches 1.0, O in the flue gas2The content is substantially zero. Therefore, the air excess coefficient can be set to 1 ~ 1.1 in this embodiment, and can be determined to be 1.05 in this embodiment.
Further, the second air flow rate may be expressed as Qt2＝n*L0*Vt+△QtWherein, Δ QtThe air feedback adjustment amount is the sum of the feedback adjustment amounts. By CO2Air feedback adjustment is carried out, so that the air surplus coefficient in the heating furnace 1 can be maintained at a better level, sufficient combustion is ensured, and gas resources are saved.
In the present embodiment, the combustion efficiency is controlled to be near the highest point, that is, CO2The content is controlled near the maximum value, O in the smoke2The content is below 2%. O in flue gas2Too high a content will cause the oxidation burning loss of the heated steel parts to be intensified. NO in flue gasXThe discharge also increases as the air excess factor increases. Thereby controlling the flue gas CO2The content is optimized and adjusted by taking the maximum value as a target, and multiple beneficial effects of the highest combustion efficiency, the lowest pollutant emission and the lowest steel oxidation burning loss can be realized. At the same time, the CO in the flue gas2Content ratio O2The content of CO is much higher, and for the byproduct gas of iron and steel enterprises, CO in the flue gas2The content reaches more than 20 percent, the CO content is controlled below 1000ppm in an environment-friendly way, the detection value is basically zero after the air excess coefficient reaches 1.0, and O is detected2The content is also below the unit percentage, and the air excess factor is detected to be substantially zero before reaching 1.0. Compared with the prior residual O in flue gas2Or O2And a feedback control method for CO content detection by using CO2The content detection feedback control has higher detection precision, faster response, more stable system and wider application range.
The system of the embodiment can realizeThe combustion optimization is controlled automatically in the true sense, and the beneficial effects of the highest combustion efficiency, the lowest pollutant emission and the lowest steel oxidation burning loss are obtained at the same time. The control system is applied to a steel rolling heating furnace 1, and theoretically, the furnace tail smoke O2The content can be stably controlled to be about 1 percent, compared with the flue gas O in the prior art2The content can be reduced by 1% -3%, and O2Every 1% reduction in the content can bring about a fuel saving of 4% in the kiln. Flue gas O2The content reduction can simultaneously reduce the heating oxidation burning loss of steel, compared with the flue gas O in the prior art2The content is reduced from 3 percent to 1 percent, the oxidation burning loss of steel can be reduced by 69.23 percent, and the oxidation burning loss rate of the steel rolling heating furnace 1 is controlled to be below 0.6 percent by applying the control system. The CO content of the flue gas at the tail of the furnace can be stably controlled to be less than 100ppm by applying the control system, and compared with the prior art, the CO content of the flue gas can be reduced by 0.1-0.5 percent, and the fuel saving of the furnace kiln can be brought by 2.5 percent when the CO content is reduced by 0.5 percent. Compared with the prior art, NOXThe emission theory can be reduced by more than 30%.
The present embodiment provides a combustion optimization control system 100 for a heating furnace, which includes: air regulating valve 3, gas component on-line detector 7, gas flowmeter 5 and flue gas CO2An online detector 9 and a controller 8, an air regulating valve 3 is arranged on an air pipeline, a gas composition online detector 7 and a gas flowmeter 5 are sequentially arranged on the gas pipeline according to the gas flow direction, and the flue gas CO is2The online detector 9 is arranged at the inlet of a tail flue of the heating furnace 1; air regulating valve 3, gas composition online detector 7 and flue gas CO2The online detectors 9 are in communication connection with the controller 8; the controller 8 is configured to: acquiring the gas flow detected by the gas flow meter 5, the gas component detected by the gas component on-line detector 7 and the flue gas CO2CO in the heating furnace 1 detected by the on-line detector 92Content, and current time of the currently acquired data; according to the gas flow and the gas components, a first air flow is obtained, and the forward adjustment of the air flow direction can be realized; during adjustment, the flow of the air adjusting valve 3 is adjusted to be the first air flow after time delay is carried out based on the current time, so that the detected gas component value is real data corresponding to the flow control time,the air flow regulation precision is ensured; further, according to the first air flow rate and the CO2Content, performing feedback regulation on the air regulating valve 3 to obtain a second air flow; the second air flow is the final flow of the air adjusting valve 3, and the adjusting precision is further improved through feedback adjustment. Through the system, the embodiment realizes the accurate control of the air flow of the heating furnace 1, ensures the full combustion of the fuel gas in the heating furnace 1, and reduces the emission energy saving.
The term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A combustion optimization control system for a heating furnace, comprising: air regulating valve, gas composition on-line detector, gas flowmeter and flue gas CO2The online gas component detector and the gas flowmeter are sequentially arranged on the gas pipeline according to the gas flow direction, and the flue gas CO is2The online detector is arranged at the inlet of a tail flue of the heating furnace; air control valve, gas flowmeter, online gas component detector and flue gas CO2The online detectors are in communication connection with the controller; the controller is configured to:
acquiring the gas flow detected by the gas flow meter, the gas component detected by the gas component online detector and the flue gas CO2CO in heating furnace detected by online detector2Content, and current time; wherein the current time is a time point for obtaining the gas component;
obtaining a first air flow rate according to the gas flow rate and the gas composition;
adjusting the flow size of the air adjustment valve to the first air flow rate after a delay based on the current time;
according to the first air flow and the CO2Content, performing feedback regulation on the air regulating valve to obtain a second air flow; the second air flow is the final flow size of the air adjusting valve.
2. The control system of claim 1, wherein the controller is specifically configured to:
based on model Qt1＝n*L0*VtObtaining a first air flow rate; wherein Q ist1Is a first air flow rate, n is an excess air coefficient, L0Is the theoretical amount of air, V, of fueltIs the gas flow; l is0＝4.7619*(0.5*L1+0.5*L2+2*L3+0.04-L4) Wherein L is1Is H2Theory of the inventionAmount of consumed air, L2Theoretical consumption of air for CO, L3Is CH4Theoretical amount of consumed air, L4Is the amount of oxygen in the fuel gas.
3. The control system of claim 2, wherein the air surplus factor is 1.05.
4. The control system of claim 1, wherein the controller is specifically configured to:
adjusting a feedback adjustment quantity for the first air flow to obtain a first adjustment value;
adjusting the air regulating valve to a first adjusting value to obtain flue gas CO2A first feedback detection value detected by the online detector;
when the first feedback detection value is larger than the CO2Adjusting the first adjusting value by a feedback adjusting quantity according to the adjusting direction of the last adjustment to obtain a second adjusting value; or when the first feedback detection value is smaller than the CO2Adjusting the first adjusting value by a feedback adjusting quantity according to the opposite adjusting direction of the last adjustment to obtain a second adjusting value; wherein the adjustment direction comprises an increase adjustment or a decrease adjustment;
adjusting the air regulating valve to a second adjustment value to obtain flue gas CO2A second feedback detection value detected by the online detector;
obtaining a second air flow rate when the second feedback detection value is less than or equal to the first feedback detection value;
and when the second feedback detection value is larger than the first feedback detection value, continuing to perform feedback regulation on the air regulating valve according to the second regulation value and the feedback regulation amount until the second air flow is obtained.
5. The control system of claim 1, wherein the controller is specifically configured to:
obtaining delay time according to the distance between the gas component online detector and the gas flowmeter, the section area of the gas pipeline and the gas flow;
and adjusting the flow of the air adjusting valve to the second air flow after delaying the delay time length based on the current time.
6. The control system of claim 1, wherein the controller is a PLC control system or a DCS control system.
7. The control system of claim 1, wherein the gas composition on-line detector is a multi-component on-line gas mass analyzer.
8. The control system of claim 1, wherein the flue gas CO2The on-line detector is an on-line infrared gas analyzer.
9. The control system of claim 1, wherein the flue gas CO2The online detector is a laser online detector.
10. The control system of claim 9, wherein the laser on-line detector has a detection emitting end and a detection receiving end, and the detection emitting end and the detection receiving end are respectively arranged on the furnace walls at two opposite sides of the heating furnace.
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| CN113203297A (en) * | 2021-05-08 | 2021-08-03 | 安徽大学 | Intelligent combustion optimization control system based on surface temperature of workpiece in furnace |
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